Chapter 33 Invertebrates Invertebrates Lack a backbone Account
![Chapter 33 Invertebrates Chapter 33 Invertebrates](https://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-1.jpg)
Chapter 33 Invertebrates
![Invertebrates • Lack a backbone • Account for 95% of all known animal species. Invertebrates • Lack a backbone • Account for 95% of all known animal species.](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-2.jpg)
Invertebrates • Lack a backbone • Account for 95% of all known animal species. • All but one of the 35 animal phyla.
![Porifera • Sponges are sedentary suspension feeders. • They pass water through their pores Porifera • Sponges are sedentary suspension feeders. • They pass water through their pores](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-3.jpg)
Porifera • Sponges are sedentary suspension feeders. • They pass water through their pores and extract food. • They are sessile.
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![Radial Symmetry • Cnidarians are invertebrates such as jellyfish, corals, and hydras. • Many Radial Symmetry • Cnidarians are invertebrates such as jellyfish, corals, and hydras. • Many](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-5.jpg)
Radial Symmetry • Cnidarians are invertebrates such as jellyfish, corals, and hydras. • Many inverts have radial symmetry.
![Bilateral Symmetry • Most animals are bilaterally symmetrical, and have triploblastic development. • Platyhelminthes Bilateral Symmetry • Most animals are bilaterally symmetrical, and have triploblastic development. • Platyhelminthes](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-6.jpg)
Bilateral Symmetry • Most animals are bilaterally symmetrical, and have triploblastic development. • Platyhelminthes flatworms
![Rotifera • Tiny animals inhabiting fresh water, marine, and damp soil. • Unique because Rotifera • Tiny animals inhabiting fresh water, marine, and damp soil. • Unique because](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-7.jpg)
Rotifera • Tiny animals inhabiting fresh water, marine, and damp soil. • Unique because many of them reproduce via parthenogenesis.
![Parthogenesis • Females produce offspring from unfertilized eggs. Parthogenesis • Females produce offspring from unfertilized eggs.](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-8.jpg)
Parthogenesis • Females produce offspring from unfertilized eggs.
![Parthogenesis • Some species of rotifers produce two types of eggs. • One develops Parthogenesis • Some species of rotifers produce two types of eggs. • One develops](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-9.jpg)
Parthogenesis • Some species of rotifers produce two types of eggs. • One develops into a female, the other into a short-lived male. • The male survives long enough to produce sperm that fertilize the eggs.
![Parthogenesis • Some rotifers produce females. • These females lay more unfertilized eggs that Parthogenesis • Some rotifers produce females. • These females lay more unfertilized eggs that](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-10.jpg)
Parthogenesis • Some rotifers produce females. • These females lay more unfertilized eggs that develop into more females.
![Mollusca • Have a muscular foot. • A visceral mass containing internal organs. • Mollusca • Have a muscular foot. • A visceral mass containing internal organs. •](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-11.jpg)
Mollusca • Have a muscular foot. • A visceral mass containing internal organs. • A mantle, a tissue that secretes a shell.
![Annelida • Segmented worms. Annelida • Segmented worms.](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-12.jpg)
Annelida • Segmented worms.
![Arthropoda • 2/3’s of all known species. • They have a hard exoskeleton and Arthropoda • 2/3’s of all known species. • They have a hard exoskeleton and](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-13.jpg)
Arthropoda • 2/3’s of all known species. • They have a hard exoskeleton and jointed appendages.
![Echinoderms and Chordata • Echinoderms are spiny skinned animals such as sea stars and Echinoderms and Chordata • Echinoderms are spiny skinned animals such as sea stars and](http://slidetodoc.com/presentation_image_h2/75edcad01a48ead6029983d62e30bb72/image-14.jpg)
Echinoderms and Chordata • Echinoderms are spiny skinned animals such as sea stars and sea urchins. • Chordata are the subphyla of invertebrates that contain a notochord but no vertebra.
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